SMART Gas Detector/Transmitter(4~20mA) with built-in LCD & explosion proof DA-500 C-910C, Bupyeong Woolim Lion s Valley, #425, Cheongcheon-Dong, Bupyeong-Gu, Incheon, Korea TEL: +82-32-623-7507 FAX: +82-32-623-7510 E-mail: sales@gasdna.com Web: www.gasdna.com page 1 out of 17
CONTENTS 1. Introduction -------------------------------------- page 3 2. Features eatures------------------------------------------- page 3 3. Specification ------------------------------------- page 4 4. Parts & Description ----------------------------- page 5 ~ 6 5. Sensor Calibration ------------------------------ page 7 ~ 8 6. Sensor Replacement--------------------------------- page 9 7. Wiring -------------------------------------------- page 10 8. Installation ----------------------------------- page 11 ~ 12 9.Setting Menu ------------------------------------ page 13 ~ 15 10.Sensor Calibration Menu ------------------------ page 16 ~ 17 page 2 out of 17
1> Introduction DA-500 detects various combustible & toxic gases leaked from industrial areas for gas producers, gas users, gas reservoirs, gas by-producers, and so on, in order to prevent any accidents in advance. DA-500 converts digital signal into the 4-20mA standard current output signal which can be transmitted to various devices such as PLC, DDC, or recorder to build comprehensive gas monitoring system. Also, DA-500 provides RS-485 communication signal and alarm relay contact. DC 4-20mA standard output signal realizes max 2500m long distance output signal transmission and RS-485 communication signal realizes max 1000m long distance signal transmission. 2> Features Digital process Digital processor based on built-in micro processor realizes various artificial intelligent functions which result in convenient gas monitoring environment. Self diagnosis Digital process automatically diagnoses the sensor signal and sends 2mA error signal output on the malfunction in the sensor. Auto-calibration without opening cover You don t need to open front cover for calibration. You only have to touch cover window using magnetic bar. It is quite useful for the corrective work in the explosive area. LCD display with back light LCD offers real-time display of gas density and back light offers easy reading even in dark area. User programming User programming calibration density and detection rage offers user s own operating functions. Built-in HD(high dissolution) A/D converter for accurate output signal. Multi signal output Various output signals - DC 4-20mA, 2 step-relay contact, & RS-485(option) provides best networking with all kinds of devices & equipments. 4-20mA transmitter 4-20mA output enables stable and long distance (maximum 2.5km) signal transmission. RS-485 RS-485 enables stables stable and long distance (maximum 1.2km) signal communication. Alarm output SPST 2 step relay contacts (AL1/AL2). page 3 out of 17
3> Specification Detection principle Catalytic, Electro-Chemical, TCD or NDIR Built-in display 2-lines x 8-characters LCD with back light Gas sampling Diffusion type Target gas Please refer to the target gas list. Measurement range 0 ~ 100 %LEL, 0~10,000ppm. 0~100% VOL Response time Within 10 sec., 90% / full scale Accuracy ±3% / full scale Sensor displacement Zero ±2%LEL / 6 month, span - ±2%LEL / 6 month Input power DC 20 ~ 30V Output power 4 ~ 20mA/Full Scale - 2.5km transmission Operating temp.& humidity -20 ~ 60, 5 ~ 95% RH (Non-condensing) Signal cable CVVS & CVVSB 1.25sq x 3 wire - shield type Wire conduit 1/2" or 3/4" PF, NPT Installation type Wall or Pipe Mounting Exterior material Cast Aluminum Alloy Explosion-proof Ex d IIC T5 Output 2 step- relay contact (ALARM-1/ALARM-2) Communication output RS-485 communication output(option) Sensor operation period 5 years (in air) Sensor warranty period 1 year page 4 out of 17
4> Parts & Description 1. Amp & Power Board 2. Transmitter Board H2 0%LEL page 5 out of 17
3. Parts Name and Description H2 0 %LEL 1. DETECTOR HOSING BODY 2. DETECTOR HOSING COVER 3. SENSOR HOUSING 4. M4 HEADLESS BOLT 5. CALIBRATION NIPPLE INSERT 6. SENSOR CAP 7. GAS SENSOR 8. M4 HEADLESS BOLT 9. MOUNT HOLES 10. CONDUIT CONNECTION 11. CALIBRATION KEY 12. KEY 13. KEY 14. KEY 15. ENT KEY 16. M3 HEADLESS BOLT page 6 out of 17
5> Sensor Calibration Please carry out calibration periodically in order to keep optimum sensor condition at least once a year. 1. Zero Calibration Please follow below procedure: 1 Please touch CAL key through the window of cover using magnetic bar. And then, LCD shows below: CAL [ZERO] 2 Please touch ENT key through the window using magnetic bar. And then, LCD shows below: ZERO GAS 0 %LEL 3 Please infuse standard gas such as clean air or nitrogen gas for one minute. 4 When the measured value becomes stable, please touch ENT key using magnetic bar. 5 When the zero calibration finishes, [OK] will be shown on LCD: ZERO GAS [OK] Caution: Zero calibration should be processed with clean air or 99% nitrogen gas. (For O2 gas, you must use nitrogen gas 99.8% or more.) 2. Span Calibration Please follow below procedure: 1 Please fix the calibration nipple on the sensor cap. Calibration nipple 2 Please touch CAL key through the window of cover using magnetic bar. 3 Please touch key through the window using magnetic bar to move into CAL menu. And page 7 out of 17
then, LCD shows below: CAL [SPAN] 4 Please touch ENT key though the widow using magnetic bar. And then, LCD shows below: SPAN ADJ 050 %LEL 5 Please touch & key through the window to input the calibration gas density. And then, please touch ENT key to confirm it. And then, LCD shows below: SPAN GAS 050 %LEL Density of calibration gas 6 Please infuse the standard gas for one minute until the density value becomes stable. And then, please touch ENT key. 7 Please stop calibration gas and remove the calibration nipple. And then, LCD shows below as gas density value goes down. Holding 049 %LEL 8 When the density value goes down 10%LEL or below, measuring mode starts automatically. Caution: The standard gas should be within the designated density range. If you use it out of the designated density range, the calibration is not possible and the sensor may be damaged or lifetime may be reduced extremely. (Default: gas density = 50%LEL & measuring range 0 ~ 100%LEL) Caution: Please start calibration after 4 minutes from power on after sensor replacement. page 8 out of 17
6> Sensor Replacement Please follow below procedure: 1 Please turn off the power. 2 Please open the front cover. 3 Please dissemble the display board. 4 Please disassemble the three line connector between sensor and sensor board. 5 Please pull out the headless bolt to disassemble the sensor cap. 6 Please assemble new sensor cap and tighten the headless bolt. 7 Please assemble three line connector between sensor and sensor board. 8 Pease push and insert the guide bar into the bushing of power board accurately to fix the display board. 9 Please assemble the front cover. 10 Please turn on the power. 11 Please proceed with sensor calibration. Caution Before replacing sensor, please make sure that power should be off. Please make sure whether the direction of connector s socket is correct. Please fully tighten the sensor cap and front cover to secure water proof. page 9 out of 17
6> Wiring 1. Terminals Detector Indicator 2. Cable Specification 1] Cable Type: Shield Cable 2] Transmission distance and required cable specification Transmission distance 0 ~ 500m 501 ~ 1,500m Over 1,500m Required cable specification 0.75sq 1.25sq 2.0sq page 10 out of 17
7> Installation 1. Front view H2 0 %LEL 2. Side view 3. Cable conduit and installation position Cable Conduit: 1/2, 3/4 PF/NPT. In open area, please install DA-500 as close as possible to the potential gas leakage place such as gas valve and pipe connection. In closed area, Light gas (specific gravity < 1): Please install DA-500 20 ~ 30cm from ceiling. Heavy gas (specific gravity > 1) : Please install DA-500 20 ~ 30cm from the floor. page 11 out of 17
4. Cautions Please avoid any potential electrical troubles such as rain drops. Please avoid any vibration or physical impact which can affect the output signal value. Please avoid high temperature or humidity. Please avoid any electrical noise such as motor, pump, or high voltage power line. Please choose the place where you can do repair & maintenance job easily. If it is not available, we recommend suction type detectors. page 12 out of 17
8> Setting Menu Comb Gas (measuring mode) <1> 0 %LEL <2> HI-SCALE HI-SCALE 100 3 ~ 999 <3> ALARM-1 ALARM-1 025 0 ~ 999 <4> ALARM-2 ALARM-2 050 0 ~ 999 <5> AL-TYPE AL-TYPE [H&HH] [H&HH].[L&LL] <6> AL-RESET AL-RESET [AUTO] [AUTO]..[MANUAL] <7> AL-TIME AL-TIME 030 0 ~ 99 <8> AL-BAND AL-BAND 3 0 ~ 999 page 13 out of 17
<9> INITTIME INITTIME 00:01 00:00 ~ 99:99 <10> OFFSET OFFSET 000-999 ~ 999 <11> ADDRESS ADDRESS 001 0 ~ 99 <12> BAUDRATE AL-TYPE 4800 BPS [2400].[57600] <13> MENU EXIT <1> Measuring mode Please push key for 2 seconds to start setting mode. <2> HI-SCALE Set 4 ~ 20mA output signal for full scale. (ex) If you set SCALE to 100, 4mA output signal displays 0 and 20mA output signal displays 100. <3> ALARM-1 According to AL TYPE, alarm #1 on. <4> ALARM-2 According to AL TYPE, alarm #2 on. <5> AL-TYPE(ALARM-TYPE) It has four(4) alarm types: L&L, L&H, H&L, and H&H You can use two alarm relay relay 1 & relay 2. (ex) If you set AL TYPE to H&L: page 14 out of 17
Relay 1 set high: when the measured value is higher than set value, alarm on. Relay 2 set low: when the measured value is lower than set value, alarm on. <6> AL-RESET(ALARM RESET) Select release method on alarm relay contact or buzzer. Select AUTO MANUAL <1> AUTO: The relay contact & LED releases according to set value automatically. <2> MANUAL: Only when you press reset switch, the relay contact & LED releases. <7> AL-TIME(Alarm delay time) This function is to prevent the normal operation of sensor against any momentary malfunctions affected by outside impact or noise. (ex) When alarm value sets 50 & AL TIME sets 5. Only when the measured value keeps higher than alarm set value during longer than 5 seconds, alarm on. <8> AL-BAND(Alarm dead band) Relay output usually repeats on/off around the alarm set value and it makes trouble. D-BAND function gives hysteresis value on the alarm set value to remove this kind of trouble. (ex1) If ALARM 1 sets 20 & ALRAM 2 sets 50, ALARM TYPE sets H&H & AL-BAND sets 3 When value displays higher than 20 and 50, alarm on lower than 17 (ex2) If ALARM 1 sets 20 & ALRAM 2 sets 50,, ALARM TYPE sets L&H & AL-BAND sets 3 When value displays lower than 20 and higher than 50, alarm on higher than 23,alarm off <9> INITTIME(Initialization time) After certain time from power on, sensor can provide stable output. <10> OFFSET(correction for measured value) Compensate the measured value. (ex) OFFSET: If it sets +5, When the measured value is 5, it displays 0 after compensation of +5. <11> ADDRESS - Set RS-485 address.(0 ~ 99) <12> BAUDRATE - Set RS-485 baud rate. page 15 out of 17
9> Sensor Calibration Menu <1> Comb Gas (measuring mode) 0 %LEL CAL <2> CAL ENT ZERO GAS <2-1> [ZERO] 0 %LEL ENT ZERO GAS [OK] ZERO GAS [FAIL] <3> CAL [SPAN] ENT <3-1> SPAN ADJ SPAN ADJ 050 %LEL 3 ~ 999 %LEL ENT <3-2> SPAN GAS SPAN GAS 050 %LEL 3 ~ 999 %LEL SPAN GAS SPAN GAS [OK] [FAIL] <3-3> Holding 020 %LEL page 16 out of 17
<1> Calibration mode Please touch CAL key on the window using magnetic bar to start calibration mode. <2> Zero calibration At CAL [ZERO], please touch ENT key on the window using magnetic bar. When ZERO GAS <0.0 %LEL> shows on LCD, please infuse clean air or 100% nitrogen gas until the measured value becomes stable. And then, please touch ENT key on the window to confirm it. If the zero calibration is successful, ZERO GAS [OK] will be displayed. If calibration is not successful, ZERO GAS [FAIL] will be displayed during 2 seconds. <3> SPAN CALIBRATION (ex) Target gas: H2 Standard gas : H2(50 %LEL)+Air Balance (1) At the CAL [SPAN], please touch the ENT key on the window using magnetic bar. (2) Please input the density value of standard H2 gas, 50%LEL, using and key on the window using magnetic bar. And then, please touch ENT key to confirm it. LCD shows below: SPAN ADJ 050 %LEL (2) Please infuse the standard H2 gas until the displayed value becomes stable as LCD shows below picture. And please touch ENT key to confirm it. SPAN GAS 050 %LEL (3) If the SPAN calibration is successful, LCD shows below: SPAN GAS [OK] (4) Measuring mode will start automatically when the density value goes down under 10%LEL. Holding 9 %LEL page 17 out of 17